Roller shaft assembly and washing machine
By installing an elastic element between the bearing housing and the shaft of the drum washing machine and applying a preload to buffer the shaft movement, the problem of bearing damage caused by the main shaft movement is solved, and the operational reliability of the washing machine is improved.
Patent Information
- Application Number
- CN202422901785.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-26
AI Technical Summary
In drum washing machines, axial movement of the main shaft causes some bearings to bear large impact forces, which can easily damage them and reduce the operational reliability of the washing machine.
An elastic element is used between the bearing housing and the shaft to apply a preload to the bearing, buffering the movement of the shaft and the bearing and preventing a single bearing from bearing excessive impact force.
The preload between bearings is enhanced, avoiding the problem of individual bearings being easily damaged and improving the operational reliability of the washing machine.
Smart Images
Figure CN223496863U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of household appliance technology, specifically to a drum shaft assembly and a washing machine. Background Technology
[0002] Drum washing machines are a common household appliance used for cleaning clothes. In related technologies, the main shaft that drives the drum to rotate is mainly supported by bearings. However, in actual use, due to the action of the drum, the main shaft will move axially. The force generated by this movement may only act on individual bearings, making the individual bearings more susceptible to damage due to the large impact force, thus reducing the reliability of the washing machine. Utility Model Content
[0003] This utility model aims to at least partially solve one of the technical problems in the related art.
[0004] Therefore, this utility model embodiment proposes a roller shaft assembly that can enhance the elastic preload between bearings, avoiding the situation in related technologies where individual bearings are subjected to large impact forces due to shaft movement and bearing counter-movement, thereby avoiding the problem of individual bearings being easily damaged and improving operational reliability.
[0005] This utility model embodiment also proposes a washing machine including the above-described drum shaft assembly.
[0006] The roller shaft assembly of this utility model embodiment includes:
[0007] A shaft and a bearing housing, wherein the bearing housing is sleeved on the outer periphery of the shaft;
[0008] A first bearing is assembled between the shaft and the bearing housing;
[0009] An elastic element is disposed between the bearing housing and at least one of the first bearing and the shaft, and the elastic element is used to apply an elastic force to the first bearing.
[0010] In some embodiments, a gap is provided between the first bearing and the bearing housing, the elastic element is assembled within the gap, and the elastic element abuts against the bearing housing and the first bearing.
[0011] In some embodiments, the inner peripheral wall of the bearing housing is provided with a protrusion, the gap is located between the protrusion and the first bearing, and the elastic element abuts between the protrusion and the first bearing.
[0012] In some embodiments, the elastic element abuts between the bearing housing and the outer ring of the first bearing.
[0013] In some embodiments, the elastic element is annular and sleeved on the outer periphery of the shaft.
[0014] In some embodiments, the elastic element is a counter-rotating wave spring.
[0015] In some embodiments, the shaft body is provided with a first shoulder, which is used to abut against the inner ring of the first bearing.
[0016] In some embodiments, including:
[0017] The motor rotor is sleeved on the outer periphery of the shaft and located on the side of the first bearing away from the drum;
[0018] A fastener is fitted to the end of the shaft opposite to the roller, and the inner ring of the first bearing and the motor rotor are clamped and fixed between the first shaft shoulder and the fastener.
[0019] In some embodiments, a second bearing is included, which is disposed adjacent to the roller relative to the first bearing, and the shaft body is provided with a second shoulder for abutting against the inner ring of the second bearing.
[0020] In some embodiments, the radial dimension of the second bearing is greater than the radial dimension of the first bearing.
[0021] The washing machine of this utility model embodiment includes the drum shaft assembly as described in any of the above embodiments.
[0022] Beneficial effects: The drum shaft assembly and washing machine of this utility model embodiment can enhance the preload between bearings, avoid the situation in related technologies where individual bearings are subjected to large impact forces due to shaft movement and bearing opposite movement, thereby avoiding the problem of individual bearings being easily damaged and improving the reliability of operation. Attached Figure Description
[0023] Figure 1 This is a cross-sectional schematic diagram of the roller shaft assembly according to an embodiment of the present utility model.
[0024] Figure label:
[0025] 1-Shaft body; 11-Second shoulder; 12-First shoulder;
[0026] 2-Bearing housing; 21-Protrusion;
[0027] 3-First bearing;
[0028] 4-Elastic element;
[0029] 5-Second bearing;
[0030] 6-Electronic rotor;
[0031] 7-Fasteners. Detailed Implementation
[0032] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0033] This utility model is based on the inventor's discovery and understanding of the following facts and problems:
[0034] In related technologies, the main shaft of the drum is supported and limited by two bearings. The outer rings of the two bearings are interference-fitted with the bearing housings. The main shaft, which is connected to the drum, passes through the center holes of the two bearings. There is a gap between the inner ring of the large bearing on the drum side and the step of the shaft. The large bearing mainly bears radial force and the axial force is very small. As a result, the axial force generated by the washing machine drum under load is applied to the small bearing on the other side.
[0035] Secondly, the washing machine drum also experiences slight axial movement during operation. The impact force of this movement will act on the small bearing on the right side, making it easy to damage the small bearing and reducing the reliability of the washing machine's operation.
[0036] like Figure 1 As shown, the roller shaft assembly of this utility model embodiment includes a shaft body 1, a bearing seat 2, a first bearing 3, and an elastic element 4.
[0037] The bearing housing 2 is fitted onto the outer circumference of the shaft body 1. For example, as... Figure 1 As shown, the shaft 1 can be generally round and can extend in the left-right direction. The bearing housing 2 can be generally tubular, with the inner diameter of the bearing housing 2 being larger than the outer diameter of the shaft 1. The shaft 1 can be assembled inside the bearing housing 2 and has a clearance fit with the inner wall of the bearing housing 2.
[0038] The first bearing 3 is assembled between the shaft body 1 and the bearing seat 2. The left end of the shaft body 1 can be connected to the roller, etc., and the right end of the shaft body 1 can be connected to the rotor of the motor, etc. In use, the rotation of the motor rotor can drive the shaft body 1 to rotate, thereby realizing the rotation drive of the roller.
[0039] The elastic element 4 is disposed between the bearing housing 2 and at least one of the first bearing 3 and the shaft 1, and the elastic element 4 is used to apply an elastic force to the first bearing 4. For example, as Figure 1As shown, the inner peripheral wall of the bearing housing 2 can protrude to a certain extent, and the elastic element 4 can be installed between the protrusion of the bearing housing 2 and the first bearing 3. The elastic element 4 can have a certain elastic effect. For example, the elastic element 4 can be a spring, rubber or other elastic structural component.
[0040] When the shaft 1 and the first bearing 3 move axially during use, the movement of the shaft 1 and the first bearing 3 is buffered by the elastic element 4. This avoids the situation in related technologies where the shaft moves and the bearings move in opposite directions, causing individual bearings to bear large impact forces. This also avoids the problem of individual bearings being easily damaged and improves the reliability of operation.
[0041] In some embodiments, the roller shaft assembly further includes a second bearing 5, which is mounted between the shaft body 1 and the bearing housing 2, and the first bearing 3 and the second bearing 5 are arranged axially spaced along the shaft body 1, wherein the second bearing 5 is arranged closer to the roller than the first bearing 3. Specifically, the second bearing 5 and the first bearing 3 are arranged spaced apart in the left-right direction, wherein the second bearing 5 may be located near the left end of the shaft body 1, while the first bearing 3 may be located near the right end of the shaft body 1.
[0042] Both the second bearing 5 and the first bearing 3 can be ball bearings, roller bearings, etc. The inner rings of both the second bearing 5 and the first bearing 3 can be fitted onto the outer circumference of the shaft 1, while the outer rings of both can be assembled with the inner circumferential wall of the bearing housing. After the first and second bearings are installed, the right side of the first bearing 3 can be stopped and limited, and the bearing cap will also stop and limit the left side of the second bearing 5.
[0043] In use, because the elastic element 4 supports the first bearing 3 and the bearing cap, the preload force ensures that the second bearing 5 and the first bearing 3 maintain a corresponding distance in the left and right directions. Thus, when the shaft 1 moves in the left and right directions, the impact generated by the movement can be applied to the second bearing 5 and the first bearing 3 simultaneously due to the preload force of the elastic element 4. This avoids the situation in related technologies where the impact force generated by the movement is completely applied to the first bearing 3 due to the large gap between the shaft 1 and the second bearing 5. This allows the second bearing 5 and the first bearing 3 to withstand the axial impact force simultaneously.
[0044] In this embodiment of the invention, the drum shaft assembly uses a preload-bearing elastic element 4 placed between the first bearing 3 and the bearing seat 2. The preload of the elastic element 4 ensures that the bearing has no axial movement or only slight axial movement under load conditions. This preload also eliminates the gap between the second bearing 5 and the shaft step. Thus, the axial force generated by the drum during operation is simultaneously applied to both bearings through the shaft body 1, avoiding the situation where the gap between the second bearing 5 and the shaft step causes a large impact on the first bearing 3, thereby increasing the reliability of the washing machine operation.
[0045] In some embodiments, the inner peripheral wall of the bearing housing 2 is provided with a protrusion 21, the protrusion 21 is located between the second bearing 5 and the first bearing 3, and the elastic member 4 acts between the protrusion 21 and the outer ring of the first bearing 3.
[0046] For example, such as Figure 1 As shown, the protrusion 21 can be integrally formed on the inner peripheral wall of the bearing housing 2. In the left-right direction, the protrusion 21 can be located on the right side of the second bearing 5 and simultaneously on the left side of the first bearing 3, and the protrusion 21 can be arranged closer to the first bearing 3 than the second bearing 5. An annular assembly gap can be reserved between the protrusion 21 and the first bearing 3, and the aforementioned elastic member 4 can be assembled within this assembly gap. The left side of the elastic member 4 can abut against the protrusion 21, and the right side of the elastic member 4 can abut against the outer ring of the first bearing 3, thereby improving the convenience of installation.
[0047] In some embodiments, the elastic element 4 is annular and sleeved on the outer periphery of the shaft 1, and the protrusion 21 extends circumferentially along the bearing seat 2 to close into a circle. For example, as Figure 1 As shown, the elastic element 4 can be generally annular, and the protrusion 21 can also be an annular structure, which can surround the outer periphery of the shaft 1. The annular end face on the left side of the elastic element 4 can abut against the protrusion 21, and the annular end face on the right side of the preload can abut against the outer ring of the first bearing 3, thereby enhancing the uniformity of the preload force applied by the elastic element 4 in the circumferential direction of the shaft 1, and further ensuring the stability of the overall structure.
[0048] In some embodiments, the elastic element 4 is a counter-rotating spring. The counter-rotating spring has excellent elasticity and toughness, which fully meets the requirements for preload.
[0049] In some embodiments, the shaft 1 is provided with a first shoulder 12, which is located between the second bearing 5 and the first bearing 3, and is used to abut against the inner ring of the first bearing 3. For example, as Figure 1 As shown, the first shoulder 12 can also be integrally formed on the outer periphery of the shaft body 1. The first shoulder 12 can be located on the left side of the first bearing 3, and the first shoulder 12 can abut against the left side of the inner ring of the first bearing 3, thereby playing the role of axially limiting the first bearing 3.
[0050] In some embodiments, such as Figure 1 As shown, the roller shaft assembly includes a motor rotor and fasteners 7. The motor rotor is sleeved on the outer periphery of the shaft body 1 and located on the side of the first bearing 3 opposite to the second bearing 5. For example, the motor rotor can be located on the right side of the first bearing 3.
[0051] Fastener 7 is assembled at the end of shaft 1 away from the roller. The inner ring of the first bearing 3 and the motor rotor are clamped and fixed between the first shaft shoulder 12 and fastener 7. For example, fastener 7 can be a screw, bolt, etc. The right end of shaft 1 can be provided with a threaded hole, and fastener 7 can be threaded into the threaded hole. The inner ring of the first bearing 3 and the motor rotor can be clamped and fixed between the first shaft shoulder 12 and the end of fastener 7, thereby realizing the connection and fixation of motor rotor and shaft 1.
[0052] Optionally, the fastener 7 may also include a washer, which may be fitted onto the outer periphery of the screw or bolt, and the right side of the motor rotor may be stopped and limited by the washer.
[0053] In some embodiments, the shaft 1 is provided with a second shoulder 11, and the second bearing 5 is located between the second shoulder 11 and the first bearing 3. The second shoulder 11 is used to abut against the inner ring of the second bearing 5, and the preload applied by the elastic member 4 is used to eliminate the gap between the second shoulder 11 and the second bearing 5.
[0054] For example, such as Figure 1 As shown, shaft 1 can be generally considered a stepped shaft, meaning that the radial dimension of shaft 1 varies in steps along its axial direction. The radial dimension of the left side of shaft 1 can be the largest, while the radial dimension of the right side of shaft 1 can be the smallest.
[0055] The second shoulder 11 can be formed by a step between two parts of the shaft body 1 with different radial dimensions. The second shoulder 11 can be located on the left side of the second bearing 5, and the second shoulder 11 can abut against the inner ring of the second bearing 5 during use, thereby satisfying the axial positioning requirement of the second bearing 5.
[0056] It should be noted that, due to the preload applied by the elastic element 4, the gap between the inner ring of the second bearing 5 and the second shoulder 11 can be eliminated, thereby avoiding the situation where the shaft 1 moves only to the first bearing 3 when the gap is large and movement is caused by movement.
[0057] In some embodiments, the radial dimension of the second bearing 5 is larger than the radial dimension of the first bearing 3. For example, as... Figure 1As shown, the radial dimension of the inner ring of the second bearing 5 is larger than that of the inner ring of the first bearing 3, and the radial dimension of the outer ring of the second bearing 5 is also larger than that of the outer ring of the first bearing 3.
[0058] This ensures that the dimensions of the two bearings meet the installation requirements of the stepped shaft 1. Secondly, since the second bearing 5 is to be arranged adjacent to the roller, its larger size also enhances the overall structural stability.
[0059] The following describes a washing machine according to an embodiment of the present invention.
[0060] The washing machine of this embodiment includes a drum shaft assembly, which can be the drum shaft assembly described in any of the above embodiments. Specifically, the washing machine is a drum washing machine, and the drum of the washing machine can be mounted on the left end of the aforementioned shaft.
[0061] The washing machine of this utility model embodiment can avoid the impact caused by shaft movement being applied to individual bearings, thus avoiding the failure of individual bearings due to impact. This reduces the noise and frequent malfunctions caused by bearing failure, resulting in high overall operational reliability.
[0062] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.
Claims
1. A roller shaft assembly, characterized in that, include: A shaft and a bearing housing, wherein the bearing housing is sleeved on the outer periphery of the shaft; A first bearing is assembled between the shaft and the bearing housing; An elastic element is disposed between the bearing housing and at least one of the first bearing and the shaft, and the elastic element is used to apply an elastic force to the first bearing.
2. The roller shaft assembly according to claim 1, characterized in that, A gap is provided between the first bearing and the bearing housing, the elastic element is assembled in the gap, and the elastic element abuts between the bearing housing and the first bearing.
3. The roller shaft assembly according to claim 2, characterized in that, The inner peripheral wall of the bearing housing is provided with a protrusion, the gap is located between the protrusion and the first bearing, and the elastic element abuts between the protrusion and the first bearing.
4. The roller shaft assembly according to claim 1, characterized in that, The elastic element abuts between the bearing housing and the outer ring of the first bearing.
5. The roller shaft assembly according to claim 1, characterized in that, The elastic element is annular and sleeved on the outer periphery of the shaft.
6. The roller shaft assembly according to any one of claims 1-5, characterized in that, The elastic element is a counter-rotating wave spring.
7. The roller shaft assembly according to any one of claims 1-5, characterized in that, The shaft body is provided with a first shoulder, which is used to abut against the inner ring of the first bearing.
8. The roller shaft assembly according to claim 7, characterized in that, include: The motor rotor is sleeved on the outer periphery of the shaft and located on the side of the first bearing away from the drum; A fastener is fitted to the end of the shaft opposite to the roller, and the inner ring of the first bearing and the motor rotor are clamped and fixed between the first shaft shoulder and the fastener.
9. The roller shaft assembly according to any one of claims 1-5, characterized in that, The device includes a second bearing, which is disposed adjacent to the roller relative to the first bearing. The shaft body is provided with a second shoulder for abutting against the inner ring of the second bearing.
10. The roller shaft assembly according to claim 9, characterized in that, The radial dimension of the second bearing is greater than that of the first bearing.
11. A washing machine, characterized in that, Includes the roller shaft assembly as described in any one of claims 1-10 above.